Can you help me with calculating grids? I've been using this (http://typophile.com/files/How you make a grid.pdf) guide to try and work out how to construct my page grid. I've set my text area, counted my lines, and adjusted for an even division. When I try and apply the grid to my margined page, the number of lines doesn't flow correctly (eg. they don't fit the grid size as they should) and cross over the gutters in odd places.

I've ordered a copy of Muller-Brockman's tome but it'll be a week or more before that lands. Can anyone help me with the correct calculations for working out a basic grid?

Thankyou!